Bolt anchor



March 25, 1930. I I .J. KARITZKY 1,751,818

BOLT ANCHOR Filed Sept. 28, 1928 5 Sheets-Sheet 1 March 25, 1930. J.KARITZKY 1,751,818

BOLT ANCHOR Filed Sept. '28. 1928 3 Sheets-Sheet -2 ATTORNEY I05 l// /051 l /0/ I v r /05 4 /05 I INVENTOR.

March 25, 1930. J. KARITZKY 1,751,818

BOLT ANCHOR Filed Sept. .28, 1928 3 Sheets-Sheet 3 Z// v r j Z/INVENTOR.

' BY 1 l ATTOkNEY Patented Mar. 25, 1930 UNITED STATES PATENT OFFICEJOHN KARITZKY, OF GARWOOD, NEW JERSEY, ASSIGNOR T HENRY B. NEWHALLCORPORATION, OF GARWOOD, NEW JERSEY, A CORPORATION OF NEW JERSEY BOLTANCHOR Application filed. September 28, 1928. Serial No. 308,929.

My invention relates to bolt anchors and more particularly to a ductilebolt anchor which will permit a particular sized bolt anchor to be usedwith the greatest possible range of screws or other expanding means,

of different sizes or diameters.

My invention further relates to an article of manufacture, combinationsand details of constructions, which will be more fully hereinafterdescribed in the specification and pointed out in the claims.

My invention is to be considered in connection with, and isanimprovement upon, United States Letters Patents 1,057,975

Newhall and Pleister, patented April 1, 1918 1,499,071 Pleister,patented June 24, 1924;

1,499,072, Pleister patented June 24, 1924.

In the accompanying drawings showing different illustrative embodimentsof my invention, and in which the same reference numerals refer tosimilar parts in the several figures Fig. 1 is a side elevation of thepreferred form of my bolt anchor;

Fig. 2 is a front elevation of the outer end of the bolt anchor;

Fig. 3 is a rear elevation of the inner end of the bolt anchor;

Fig. 4 is a longitudinal vertical section on the line 44 of Fig. 2,looking in the direction of the arrows;

Fig. 5 is a transverse vertical section on the line 55 of Fig. 4 lookingin the direc tion of the arrows; V

Fig. 6 is a transverse vertical section on the line 66 of Fig. 4,looking in the direction of the arrows;

Fig. 7 is a vertical section through a wall or other suitable support.the work and the bolt anchor, a small screwbeing shown cooperating withthe bolt anchor;

Fig. 8 is a cross section on line 8-8 of Figure 7 looking in thedirection of the arrows; i Fig. 9 is a cross section on line 9-9ofFig.

7 looking in the direction of the arrows;

Fig. 10 is a vertical section illustrating a larger and shorter screwcooperating with the bolt anchor, and not engaging with the supplementalsecondary longitudinally extending ribs;

Fig. 11 is a cross-section on line 1111 of Figure 10, looking in thedirection of the arrows; V I

Fig. 12 is a vertical section, similar to Figure 10, illustrating ashort bridle ring shank cooperating with the bolt anchor;

Fig. 13 is a front elevation of Figure 12;

Fig. 14 is a vertical section, similar'to Figure 6, but of a,modification, in which the exterior longitudinally extending valleys orvoids are not in radial alignment with the interior primary ribs, as inthe preferred construction, Figures 1 to 11, inclusive;

Figs. 1519 illustrate'another modification. Fig. 15 is a plan of thismodification;

Fig. 16 is a front elevation of the outer end of the modification ofFigure 15;

Fig. 17 is a rear elevationof the inner end of the modificationillustratedin Figure 15; i Fig. 18 is a longitudinal vertical section ofthe modification illustrated in "Figure 15; I Fig. 19 is a verticalsection through a wall or other support, the bolt anchor and the worksupported. p

In installing attachments, such as electrical fixtures, insulatorbrackets, cable clamps, bridle rings, or any form of attachment, whichvary in size and duty to be performed, different sizebolt anchorsandparticular size screws, to fit the particular size bolt anchor have tobe used. 1 Thisrequires a contractor to keep in stock and to send outhis mechanics with several sizes of bolt anchors and corresponding sizesof screws, to fit the difierent size bolt anchors. To drill the holesfor the ductile bolt anchors, the different size drills to correspondwith the particular size ductile anchor, have to be bought'and kepton'hand.

By my presentinvention I permit work, of the greatest possible range, tobe held to a wall or other suitable support by a ductile anchor of a.given size. In my present invention, for example, with a given sizeductile anchor I may use variable diameters of screws, for example, from#8 to #14. This eliminates the necessity of the contractor car'- ryingin stock. ductile anchors of intermediate sizes. This also permits thecontractor to equip his mechanics with one size ductile anchor and onesize drill to perform practically all the work that they will berequired to perform on a given job, which ordinarily would requiredifierent size bolt anchors and corresponding screws. It will be seen,therefore, that his investment in ductile anchors need be only a fewsizes, for each size will accommodate four, five or more sizes ofscrews, bridle rings or other expanding means. and error on the part ofthe mechanics in using the wrong bolt anchor, in the wrong place andgreatly simplifies the work and reduces the cost of installation.

In addition to the advantages just enumerated, the bolt anchor built inaccordance with my invention, has additional advantages among others, towit (1) It insures an extreme expansion at the inner end of the boltanchor, beyond what could be had by merely increasing the height of theinterior primary longitudinally extending ribs.

(2) It permits the larger size screw, in-

tended for use with my bolt anchor, to turn freely, untilthesupplemental or secondary expanding means is encountered and then, andnot until then, will the greatest resistance against turning of thescrew be met, which, however, will be at a point where the screw isnearly screwed home. This permits quick installation of the work.

(3) It permits shorter screws of greater than minimum diameter to beeasily inserted and obtain a good hold when the screw is not long enoughto cooperate with the supplemental or secondary expanding means.

(4:) It permits lower integral primary lon gitudinally expanding ribs atthe outer portion of the axial bore, to permit the unthreaded portion ofa screw to enter freely without binding, allowing thethread on the screwto cut deeply and with greater expansion at the inner end of the boltanchor.

(5) It insures a maximum expansion of the bolt anchor before the screwreaches the inner end of the shield, and from that point on produces along area of maximum expansion with greatly increased holding capacity.

Other advantages will be apparent to those skilled in the art.

In Figures 1 to 11 inclusive, I have shown the preferred form of myinvention; in Figure 14 a modification; and in Figures 15 to 19inclusive, a still further modification, it, of course, being understoodthat these are merely illustrative.

In the preferred form of my invention, Figures 1-11, my bolt anchor 1is'preferably formed of lead, or alloy, or other ductile metal andprovided with a body member 2, usually in the form of a ring, to whichare connected a plurality of tines, two integral tines, 3 and 4' beingpreferably employed,

My invention also saves confusion' though of course, the number of timesmay be increased without departing from my invention.

In this preferred form, the exterior of the bolt anchor 1, is providedwith a plurality of longitudinally extending grooves or voids 5-5; thesegrooves preferably increase in depth from the point 6 to the inner end 7of the bolt anchor. In this preferred form the axial bore 8 of the boltanchor is provided 7 a with a plurality of longitudinally extendingprimary ribs 99, which start within the body member or ring 2 and extendto the end 7 .of the bolt anchor. These primary ribs 9, 9 are parallelto the exterior grooves or voids 5-5 and preferably in substantialradial alignment with them. By having the exterior valleys or voids 5, 5of the greatest depth at the inner end 7 of the bolt anchor, and havingthe longitudinally extending primary ribs 9, 9 in radial alignment withthem, allows for the greatest displacement of the metal of the anchor atthe points of greatest expansion, when the largest screws are used. Thevoids or valleys 5, 5 formed on the exterior, and the voids 10, 10formed on the interior of the bolt anchor by the longitudinallyextending primary ribs 9, 9-will be filled up more, or less, by themetal of the ductile anchor, depending upon the degree ofexpansionemployed.

F or example, in using the smallest screw,

or other expanding means, the voids on the interior and exterior of theductile anchor 1, will not be substantially changed from their originalcondition, for the small'screw will simply engage with thelongitudinally extending primary ribs 9, 9 and in this manner expand thebolt anchor, giving'a firm and strong grip on the interior of the wallor other suitable support. With a larger screw, the metal of the boltanchor will be more or less displaced, so that the voids 10, 10 on theinteriorrand the voids or valleys 5, 5 on the exterior, will be more orless filled up. ith a screw of the maximum diameter, for the particularsize bolt anchor, the metal of the bolt anchor will be put under suchpressure and so distorted as to substantially fill up all the interiorand exterior voids 10 and 5 respectively.

By arranging the exterior valleys or voids 5, 5 parallel to the interiorprimary longitudinal ribs 9, 9, and in radial alignment with saidinterior ribs, the metal just back of the ribs will be readily forcedradially and fill up the voids formed by said valleys. By arranging thevalleys in this manner I also get a bolt anchor of the same strengthwith less metal, which materially decreases the cost of manufacture.

In addition to the interior primary longitudinal ribs 9, 9, I mount onthe interior of the bolt anchor supplemental or secondary expandingmeans, which are preferably though not necessarily, in the form of oneor more supplemental or secondary ribs 11, 11, two being shown by way ofexample in Figures 1 to 11 inclusive. These supplemental or secondaryribs 11, 11 start adjacent to the inner end 7 of the bolt anchor andextend to a point which is intermediate the inner end 7 and the outerend 12 of the anchor. Preferably they extend to the point 13, therebychoking down the area of the axial bore 8 at this point.

By this construction I obtain the very material advantages in a boltanchor, previously enumerated herein under the numerals 1 to 5.

. Further, without these supplemental or secondary ribs, 11, 11, higherlongitudinally extending primary ribs 9, 9 would be required to give theproper allowance for displacement which would counteract the freeact-ion of the screw in the axial bore adjacent the outer end 12. Forexample, a #14 screw, the largest size for use with this particular sizeanchor, will turn freely until. its maximum expansion is reached at thesupplemental or secondary ribs 11, 11, at which point it will be turnedin with greater efiort but with more powerful expansion. When a long #8screw is used it will receive less support at the outer end 12 where thelow primary ribs 9, 9 are purposely placed to permit the unthreadedportion of the #14 screw to pass in freely, but this same #8' screw,which will work quite loosely at the outer end, will obtain a verysubstantial grip at the inner end due to the supplemental or secondaryribs 11, 11.

It will be clear from Figures 4 and 7 that when the end 16 of a screw,such as 17, reaches the two supplemental or secondary expanding means,in the form of the secondary ribs 11, 11, the area of the axial bore 8,is choked down and the maximum expansion takes place from approximatelythe points 18, 18 to the inner end 7 ofthe anchor, rather than at theend 7 of the anchor, thereby producing a long area of maximum expansionwith greatly increased holding capacity, Figure 7.

I preferably provide the exterior of my anchor l with longitudinallyextending ribs 20, 20 to engage with the surface of the hole 21, in awall or other support 22, formed of masonry, brick, terra cotta,concrete or other similar material, against the surface of which thework 23 is to be supported. My anchor is also preferably provided withthe usual slots 24, 24 between the tines 3 and 4 to permit more readyexpansion of the anchor.

In Figures 12 and 13, I have shown a.

bridle ring 25 with a short, thick screw threaded shank 26, cooperatingwith the longitudinally extending primary ribs 9, 9 of the bolt anchor1, the shank 26, not being long enough to engage with the supplementalor secondary ribs 11, 11. The bridle ring is shown supporting bridle ordrop wires 27, 27. In Figure 14 I have shown a modification in which thebolt anchor 101 is provided with the supplemental or secondarylongitudinally extending ribs 111, 111, the same as ribs 11, 11 inFigures 1 to 11 inclusive, but the interior longitudinally extendingprimary ribs 109, 109 are not located in'radial alignment with theexterior longitudinally extending valleys or voids 105, 105.

In Figures 15 to 19 I have shown another modification of my invention.

In this form the bolt anchor 102 is formed of ductile material the sameas in the other forms and is provided with a body or ring member slots31, 31, and short exterior ribs 32, 32. It is also provided with theinterior longitudinally extending ribs 209, 209, the same as the primaryribs 9, 9, in the form illustrated in Figures 1 to 11', inclusive. Inaddition, it is also provided with the supplemental or secondary ribs211, 211, which are duplicates of the ribs 11, 11 in the first form andperform the same function.

The exterior of the bolt anchor 102 is different from the first andsecond forms shown respectively in Figures 1 to 13 inclusive, and inFigure 14, in that the longitudinally extending valleys or voids are notemployed. Instead, the exterior of the bolt anchor 102 is provided withcross ribs 35, 35, forming cross. valleys or voids 36, 36.

Having thus described this invention in connection with differentillustrative embodiments thereof, to the details of which I do notdesire to be limited, what is claimed as new and what is desired tosecure. by Letters Patent is set forth in the appended claims.

What I claim is: I v i 1. A new article of manufacture comprising aductile anchor provided with an axial bore and primary interiorlongitudinally extending expanding means, and secondary interiorlongitudinally extending expanding a means of'shorter length than theprimary expanding means said secondary means being mounted near theinner end of the anchor.

2. A new article of manufacture comprising a ductile anchor providedwith an axial bore and primary interior longitudinally extendingexpanding means, and secondary interior longitudinally extendingexpanding means of shorter length than the primary expanding means saidsecondary means being mounted near the inner end of the anchor, andalternating with the primary expanding means.

JOHN KARITZKY.

